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The migration of railway communication technology from GSM-based to LTE-based has been decided by International Union of Railway. This means that a future train control system will be one based on LTE accordingly. For the highest reliability of train operation in such a system, a fully duplicated network structure with overlaid radio cells is needed. Existing methods and results are often relied on...
This paper concerns the uplink (UL) and downlink decoupled access in heterogeneous networks (HetNets) with multi-antenna base stations (BSs). Departure from the traditional minimum pathloss policy, a maximum UL signal-to-noise ratio (SNR) user association policy that takes account of multiple antennas at BSs is proposed. Based on the proposed association policy, the UL association probabilities and...
This paper investigates the joint power and admission control problem for a multi-pair massive multiple-input multiple-output (MIMO) amplify-and-forward relaying system. Our aim is to minimize the total transmit power for users while maximizing the number of supported users by adopting the new linear programming deflation (NLPD) algorithm. Here, the removal strategy of the NLPD algorithm is compared...
Device-to-device (D2D) communication has been proposed as a solution for vehicle-to-vehicle (V2V) communication, which has strict requirements on reliability and latency. Previous works on V2V communication typically assume single-antenna users, which ignore the potential of multiple antennas. By contrast, this paper studies an uplink power control problem in multi-antenna V2V underlay cellular networks...
Interference alignment (IA) is an efficient interference management technique that can result in sum-rates that scale linearly with the number of users at high signal-to-noise power ratio (SNR). But it is difficult to directly apply IA to large networks because of heavy signaling overhead and feasibility constraint. Clustered IA divides cells into disjoint clusters where IA is applied in each cluster...
Due to dense small cells deployment in a heterogeneous network, the backhaul links among the small cells and macro cell are band-limited when they share the same spectrum with the user equipments. To mitigate the intra- and inter-cell interference caused by the band-limited backhaul, we propose a recursive estimation-based zero-forcing beamforming (RE-ZFBF) scheme. Based on initial values obtained...
A problem that arises with pilot assignment in multicellular massive multiple-input-multiple-output (MIMO) systems is due to inter-cell interference, also known as pilot contamination. This paper focuses on minimizing the inter-cell interference that results from spatial correlation based on signal arrival parameters, assuming the use of a cylindrical antenna array. The signal parameters are used...
In this paper, we present a Vehicular version of the Shared UE-side Distributed Antenna System (SUDAS) i.e. Vehicular SUDAS which enables high throughput wireless communication in high mobility Vehicle-to-X (V2X) scenarios. Vehicular SUDAS uses shared virtual antennas, termed UE-side Radio Units (URUs), which utilize both licensed sub-6 GHz band and unlicensed millimetre wave band, to achieve a virtual...
This paper investigates user selection and power allocation algorithms in multi-cell massive Multiple-Input Multiple-Output (MIMO) systems. The focus is on designing an algorithm that maximizes a particular cell of interest's sum rate taking into consideration the interference from other cells. This research extends previous work and proposes suboptimal per cell resource allocation models that are...
Understanding the nature of electromagnetic (EM) wave interference is essential in EMC engineering. EM wave interference mainly includes the diffraction and fringe effects. This paper aims to visualize the diffraction and fringe effects using the canonical wedge structure.
Underlaying device-to-device (D2D) transmission in cellular wireless systems is one of the promising transmission techniques for fifth generation (5G) and beyond 5G applications. Nevertheless, the interference between the D2D pairs, the interference from cellular users to D2D receivers and the interference that affects the cellular communications should be mitigated to increase the overall system...
We consider wireless information and power transfer in a multi-user massive multiple-input multiple-output (MU-Massive-MIMO) system, where several distributed antenna sets, also denoted as remote radio heads (RRHs), are deployed, while the users can simultaneously perform information detection and energy harvesting. Assuming a large number of antennas and autonomous power allocation for the information...
The downlink of a two-layered heterogeneous hexag- onal cellular network is studied with macro base stations (MB), small cell base stations (SB) that act as half duplex analog relays, and mobile terminals (MT). The first layer is a point- to-multipoint wireless backhaul between macro base stations and small cell base stations, and the second layer is the transmission layer between SBs and MTs. The...
This paper considers a channel-unaware communication scenario in which two single-antenna nodes exchange information via multiple two-way relays, each with multiple-antennas. The nodes use differential signalling and the relays use a novel non-regenerative relaying scheme that enables self-interference to be completely eliminated. This scheme maximizes the asymptotic signal-to-interference-plus-noise-ratio...
The problem of forming an FMICW signal for vertical-incidence single-antenna ionosonde based on the USRP platform using SDR technology was solved. We carried out studies aimed at getting a constant level of a received signal, unambiguous determining virtual reflection height in the required range as well as reducing interference and correlation noise during transmission and compression. The developed...
In this paper, we propose two practical and economic beamforming design methods under consideration of an effective acquisition mechanism of partial channel state information at transmitter (CSIT) for frequency-division duplex (FDD) massive MIMO systems. In contrast to previous beamforming designs with total power constraint, per-antenna power constraints are considered in this paper because of the...
This paper proposes a novel technique for secondary user beamforming in cognitive radio networks (CRN). A practical scheme based on limited rate feedback from secondary users to secondary base station (SBS) and feedback from primary users to SBS are employed to acquire the secondary user channel and interference channel state information. Subsequently, a scheme is presented for regularized beamforming...
Target detection in the presence of mainlobe jamming (MLJ) is a challenging task for radar signal processing. Spatial filtering techniques for MLJ cancellation on uniform linear array (ULA) have been proposed recently. However, the performance of these techniques degrades greatly when MLJ is located close to target. To solve this problem, we propose a sparse detection method on uniform distributed...
Co-channel interference is a dominant limiting factor for LTE uplink system capacity. BS (Base station) MMSE-IRC (Minimum mean square error — interference rejection combining) receiver, as a promising approach for spatial domain interference handling, is introduced in LTE-Advanced Release 13. This paper firstly gives the signal model and receiver structure for BS MMSE-IRC. To evaluate MMSE-IRC performance...
To guarantee secure communication of the primary system and efficiently utilize the licensed spectrum, in this paper, we propose a two-path successive relaying and jamming based cooperative transmission (TSRJC) scheme. In TSRJC scheme, two secondary users (SU) successively relay the primary message and jam the primary eavesdropper to confirm secure and reliable transmission of the primary system during...
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